{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-5068: bt: l2cap le coc: remote oob write via seg counter stored in net_buf user_data","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-5068","status":"final","version":"1","initial_release_date":"2026-06-09T06:20:23.745Z","current_release_date":"2026-06-09T13:10:47.215Z","revision_history":[{"date":"2026-06-09T06:20:23.745Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"A remote, unauthenticated BLE peer can trigger a 2-byte out-of-bounds write in the Bluetooth host during L2CAP LE CoC SDU reassembly. When the application enables segmentation (via chan_ops.alloc_buf) and the chosen RX pool has a user_data_size smaller than 2 bytes, the segmentation counter stored in the net_buf user_data area is written out of bounds in l2cap_chan_le_recv_seg (subsys/bluetooth/host/l2cap.c). The observed effects are an AddressSanitizer abort and, without ASan, heap corruption / fatal error.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-5068 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-5068"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-5068"},{"category":"external","summary":"github.com","url":"https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-qrcq-hxwj-mqxm"}]},"product_tree":{"branches":[{"category":"vendor","name":"zephyrproject-rtos","branches":[{"category":"product_name","name":"Zephyr","branches":[{"category":"product_version_range","name":">=1.14.0 <=4.3.0","product":{"name":"zephyrproject-rtos Zephyr >=1.14.0 <=4.3.0","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:zephyrproject-rtos:zephyr:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-5068","title":"bt: l2cap le coc: remote oob write via seg counter stored in net_buf user_data","notes":[{"category":"description","text":"A remote, unauthenticated BLE peer can trigger a 2-byte out-of-bounds write in the Bluetooth host during L2CAP LE CoC SDU reassembly. When the application enables segmentation (via chan_ops.alloc_buf) and the chosen RX pool has a user_data_size smaller than 2 bytes, the segmentation counter stored in the net_buf user_data area is written out of bounds in l2cap_chan_le_recv_seg (subsys/bluetooth/host/l2cap.c). The observed effects are an AddressSanitizer abort and, without ASan, heap corruption / fatal error.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","baseScore":7.6,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}